Detachable tooth-facing for bridge and plate work.



1 @TUAWL WITNESSES O. LAMPE. NG FOR BRIDGE AND PLATE WORK.

N FILED FY1324, 1912.

Patented Aug.19,1913.

INVENTOR motorist.

entrain Wr tes a i icit WILLIAM C. LAMPE, 01 PETTSBURGH, PENNSYL'VMENIA.

DETACHABLE TDOTH-FACING FOR BRIDGE All? PLATE 'WQEK.

Application filed February 24, 1912.

Specification of .Lctters Patent.

lugs removed; Fig. 2 is a front view of .the f'acmgs with the securing pm moved; Fig. 3 15 a section on the -III-HI of Fig. 2; Fig. 4 is a. frontvlew of one of the backing plates; Fig. 5 is a detail view of one of the securing pins; Figs. (3 and 7 are sectional views illustrating the application of my invention to difierent shapes of facings; F ig. 8 is a vertical section through one of the finished teeth of Fig. 1; and Figs. 9 and 10 are detail views showing different forms of the securing member.

My invention is designed to provide means of simple and convenient character for securing tooth tacings of porcelain or similar material. to a metal baclring, and further, to provide means of this character, whereby the tooth facing can be readily removed from the backing, should breakage or other causes render this necessary or desirable.

My invention consists particularly in a securing device or pin of novel form, and also in such pin in combination with a tooth facing particularly adapted for use there, with.

In the accompanying drawings, the nu meral 2- wherever seen designates a porcelain facing, which is formed in the usual man-. ner, but which is provided with two small pin holes 3 extending therein, one above the other, and having their outer end portions united by a shallow vertically extending groove 4.

5 designates the metallic backing plates for the porcelain fac'ings, each of which is formedwith an outwardly turned edge 6, to fit the correspondin portion of the facing, and thereby provi e metal rims tor the incisive edges of the teeth. Each facing secured to its backir1l 5 by means of a specially formed pin aving three prongs 7, 8 and 9. The two prongs 7 and 8 are adapted t fit into the perforations S in the shown, while porcelain facing in the manner small the third prong 9 extends through perforation 10 into the backing plate.

In fitting up a piece oi bridge work. the several teeth are fitted to their respective hat-kings. the pins are inserted in the hackings, and the porcelain tacinps are'tcmpol'urilv engaged therewith and the entire piece of work properly shaped up. The porcelain tacings are then removed, the prongs 9- ot' the securing'pins are bent over against the back surtaces'ot the leaching places and are soldered thereto, or are embedded in the investment l0 formed of solder. gaged with the prongs T and 8 of the pins and are firmly secured thereto by means of the usual cement.

The connecting portions of the pins between the prongs 7 and 8 lie within the shallow vertical grooves 4 of the i acings, thereby preventing any tendmicy ot' the tea lngs-to rotate on the pins.

readily removed from the pins and a new facing applied without. dismantling the entire bridge. 7

Fig. 9 shows a modified form of the securing pin, in which the shank 9 is split to form two prongs which, after insertion through the backing plate, can be bent over upon the plate in opposite direction. shown in dotted lines in Fig. 9. I

Fig. 10 shows another modification in which the pin is provided with two separated prongs 9*, for insertion through the backing plate.

My-invent-ion is applicable to bridge and plate work for both the upper and lower jaws and to teeth of various shapes and sizes. Thus, in Figs. 6 and 8, l show thc invention applied to molar teeth.

I claim:

1. As a new article of manufacture, a seouring" device for tooth tracings, consisting of a pin having a transverse connecting portion with two substantially parallel prongs projecting therefrom in one direction to form an open llshaped portion to engage a tooth facing, the inner sides of said prongs being substantially atright angles to the connecting portion, and the connecting portion having a bendable prong projecting in the opposite. direction; substantially as described.

it the "facing becomes broken. at any tune'm use, it can be i 2. As a new article of manufacture, a securing device .for tooth faeings, consisting of a pin having two substantially parallel separate prongs projecting in one direction to form an open U-shaped portion to engage a tooth facing, and having another prong projecting in the opposite direction from the connecting portion of the U, the last named prong being bendable, and also being Copiesof this patent may be obtained for the member at each end of said groove, and a backing plate, of a securing device Goinprising a pin having spared prongs which enter said apertures, a portion connecting the prongs and which lies in the surface groove, and an oppositely projecting prong which. is bent over and down against the backing, substantially as described. In testimony whereohl have hereunto my hand.

l-ViLLlAM C. LAMPE. Witnesses:

S. LEE McEnroe, FRANK MoANnnr.

five cents each, by addressing the Commissioner of Patents.

Washington, I). G. 

